plugeth/eth/downloader/downloader_test.go
Martin Holst Swende 3010f9fc75
eth/downloader: change intial download size (#21366)
This changes how the downloader works, a little bit. Previously, when block sync started,
we immediately started filling up to 8192 blocks. Usually this is fine, blocks are small
in the early numbers. The threshold then is lowered as we measure the size of the blocks
that are filled.

However, if the node is shut down and restarts syncing while we're in a heavy segment,
that might be bad. This PR introduces a more conservative initial threshold of 2K blocks
instead.
2020-09-02 11:01:46 +02:00

1711 lines
65 KiB
Go

// Copyright 2015 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package downloader
import (
"errors"
"fmt"
"math/big"
"strings"
"sync"
"sync/atomic"
"testing"
"time"
"github.com/ethereum/go-ethereum"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core/rawdb"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/ethdb"
"github.com/ethereum/go-ethereum/event"
"github.com/ethereum/go-ethereum/trie"
)
// Reduce some of the parameters to make the tester faster.
func init() {
fullMaxForkAncestry = 10000
lightMaxForkAncestry = 10000
blockCacheMaxItems = 1024
fsHeaderContCheck = 500 * time.Millisecond
}
// downloadTester is a test simulator for mocking out local block chain.
type downloadTester struct {
downloader *Downloader
genesis *types.Block // Genesis blocks used by the tester and peers
stateDb ethdb.Database // Database used by the tester for syncing from peers
peerDb ethdb.Database // Database of the peers containing all data
peers map[string]*downloadTesterPeer
ownHashes []common.Hash // Hash chain belonging to the tester
ownHeaders map[common.Hash]*types.Header // Headers belonging to the tester
ownBlocks map[common.Hash]*types.Block // Blocks belonging to the tester
ownReceipts map[common.Hash]types.Receipts // Receipts belonging to the tester
ownChainTd map[common.Hash]*big.Int // Total difficulties of the blocks in the local chain
ancientHeaders map[common.Hash]*types.Header // Ancient headers belonging to the tester
ancientBlocks map[common.Hash]*types.Block // Ancient blocks belonging to the tester
ancientReceipts map[common.Hash]types.Receipts // Ancient receipts belonging to the tester
ancientChainTd map[common.Hash]*big.Int // Ancient total difficulties of the blocks in the local chain
lock sync.RWMutex
}
// newTester creates a new downloader test mocker.
func newTester() *downloadTester {
tester := &downloadTester{
genesis: testGenesis,
peerDb: testDB,
peers: make(map[string]*downloadTesterPeer),
ownHashes: []common.Hash{testGenesis.Hash()},
ownHeaders: map[common.Hash]*types.Header{testGenesis.Hash(): testGenesis.Header()},
ownBlocks: map[common.Hash]*types.Block{testGenesis.Hash(): testGenesis},
ownReceipts: map[common.Hash]types.Receipts{testGenesis.Hash(): nil},
ownChainTd: map[common.Hash]*big.Int{testGenesis.Hash(): testGenesis.Difficulty()},
// Initialize ancient store with test genesis block
ancientHeaders: map[common.Hash]*types.Header{testGenesis.Hash(): testGenesis.Header()},
ancientBlocks: map[common.Hash]*types.Block{testGenesis.Hash(): testGenesis},
ancientReceipts: map[common.Hash]types.Receipts{testGenesis.Hash(): nil},
ancientChainTd: map[common.Hash]*big.Int{testGenesis.Hash(): testGenesis.Difficulty()},
}
tester.stateDb = rawdb.NewMemoryDatabase()
tester.stateDb.Put(testGenesis.Root().Bytes(), []byte{0x00})
tester.downloader = New(0, tester.stateDb, trie.NewSyncBloom(1, tester.stateDb), new(event.TypeMux), tester, nil, tester.dropPeer)
return tester
}
// terminate aborts any operations on the embedded downloader and releases all
// held resources.
func (dl *downloadTester) terminate() {
dl.downloader.Terminate()
}
// sync starts synchronizing with a remote peer, blocking until it completes.
func (dl *downloadTester) sync(id string, td *big.Int, mode SyncMode) error {
dl.lock.RLock()
hash := dl.peers[id].chain.headBlock().Hash()
// If no particular TD was requested, load from the peer's blockchain
if td == nil {
td = dl.peers[id].chain.td(hash)
}
dl.lock.RUnlock()
// Synchronise with the chosen peer and ensure proper cleanup afterwards
err := dl.downloader.synchronise(id, hash, td, mode)
select {
case <-dl.downloader.cancelCh:
// Ok, downloader fully cancelled after sync cycle
default:
// Downloader is still accepting packets, can block a peer up
panic("downloader active post sync cycle") // panic will be caught by tester
}
return err
}
// HasHeader checks if a header is present in the testers canonical chain.
func (dl *downloadTester) HasHeader(hash common.Hash, number uint64) bool {
return dl.GetHeaderByHash(hash) != nil
}
// HasBlock checks if a block is present in the testers canonical chain.
func (dl *downloadTester) HasBlock(hash common.Hash, number uint64) bool {
return dl.GetBlockByHash(hash) != nil
}
// HasFastBlock checks if a block is present in the testers canonical chain.
func (dl *downloadTester) HasFastBlock(hash common.Hash, number uint64) bool {
dl.lock.RLock()
defer dl.lock.RUnlock()
if _, ok := dl.ancientReceipts[hash]; ok {
return true
}
_, ok := dl.ownReceipts[hash]
return ok
}
// GetHeader retrieves a header from the testers canonical chain.
func (dl *downloadTester) GetHeaderByHash(hash common.Hash) *types.Header {
dl.lock.RLock()
defer dl.lock.RUnlock()
return dl.getHeaderByHash(hash)
}
// getHeaderByHash returns the header if found either within ancients or own blocks)
// This method assumes that the caller holds at least the read-lock (dl.lock)
func (dl *downloadTester) getHeaderByHash(hash common.Hash) *types.Header {
header := dl.ancientHeaders[hash]
if header != nil {
return header
}
return dl.ownHeaders[hash]
}
// GetBlock retrieves a block from the testers canonical chain.
func (dl *downloadTester) GetBlockByHash(hash common.Hash) *types.Block {
dl.lock.RLock()
defer dl.lock.RUnlock()
block := dl.ancientBlocks[hash]
if block != nil {
return block
}
return dl.ownBlocks[hash]
}
// CurrentHeader retrieves the current head header from the canonical chain.
func (dl *downloadTester) CurrentHeader() *types.Header {
dl.lock.RLock()
defer dl.lock.RUnlock()
for i := len(dl.ownHashes) - 1; i >= 0; i-- {
if header := dl.ancientHeaders[dl.ownHashes[i]]; header != nil {
return header
}
if header := dl.ownHeaders[dl.ownHashes[i]]; header != nil {
return header
}
}
return dl.genesis.Header()
}
// CurrentBlock retrieves the current head block from the canonical chain.
func (dl *downloadTester) CurrentBlock() *types.Block {
dl.lock.RLock()
defer dl.lock.RUnlock()
for i := len(dl.ownHashes) - 1; i >= 0; i-- {
if block := dl.ancientBlocks[dl.ownHashes[i]]; block != nil {
if _, err := dl.stateDb.Get(block.Root().Bytes()); err == nil {
return block
}
return block
}
if block := dl.ownBlocks[dl.ownHashes[i]]; block != nil {
if _, err := dl.stateDb.Get(block.Root().Bytes()); err == nil {
return block
}
}
}
return dl.genesis
}
// CurrentFastBlock retrieves the current head fast-sync block from the canonical chain.
func (dl *downloadTester) CurrentFastBlock() *types.Block {
dl.lock.RLock()
defer dl.lock.RUnlock()
for i := len(dl.ownHashes) - 1; i >= 0; i-- {
if block := dl.ancientBlocks[dl.ownHashes[i]]; block != nil {
return block
}
if block := dl.ownBlocks[dl.ownHashes[i]]; block != nil {
return block
}
}
return dl.genesis
}
// FastSyncCommitHead manually sets the head block to a given hash.
func (dl *downloadTester) FastSyncCommitHead(hash common.Hash) error {
// For now only check that the state trie is correct
if block := dl.GetBlockByHash(hash); block != nil {
_, err := trie.NewSecure(block.Root(), trie.NewDatabase(dl.stateDb))
return err
}
return fmt.Errorf("non existent block: %x", hash[:4])
}
// GetTd retrieves the block's total difficulty from the canonical chain.
func (dl *downloadTester) GetTd(hash common.Hash, number uint64) *big.Int {
dl.lock.RLock()
defer dl.lock.RUnlock()
return dl.getTd(hash)
}
// getTd retrieves the block's total difficulty if found either within
// ancients or own blocks).
// This method assumes that the caller holds at least the read-lock (dl.lock)
func (dl *downloadTester) getTd(hash common.Hash) *big.Int {
if td := dl.ancientChainTd[hash]; td != nil {
return td
}
return dl.ownChainTd[hash]
}
// InsertHeaderChain injects a new batch of headers into the simulated chain.
func (dl *downloadTester) InsertHeaderChain(headers []*types.Header, checkFreq int) (i int, err error) {
dl.lock.Lock()
defer dl.lock.Unlock()
// Do a quick check, as the blockchain.InsertHeaderChain doesn't insert anything in case of errors
if dl.getHeaderByHash(headers[0].ParentHash) == nil {
return 0, fmt.Errorf("InsertHeaderChain: unknown parent at first position, parent of number %d", headers[0].Number)
}
var hashes []common.Hash
for i := 1; i < len(headers); i++ {
hash := headers[i-1].Hash()
if headers[i].ParentHash != headers[i-1].Hash() {
return i, fmt.Errorf("non-contiguous import at position %d", i)
}
hashes = append(hashes, hash)
}
hashes = append(hashes, headers[len(headers)-1].Hash())
// Do a full insert if pre-checks passed
for i, header := range headers {
hash := hashes[i]
if dl.getHeaderByHash(hash) != nil {
continue
}
if dl.getHeaderByHash(header.ParentHash) == nil {
// This _should_ be impossible, due to precheck and induction
return i, fmt.Errorf("InsertHeaderChain: unknown parent at position %d", i)
}
dl.ownHashes = append(dl.ownHashes, hash)
dl.ownHeaders[hash] = header
td := dl.getTd(header.ParentHash)
dl.ownChainTd[hash] = new(big.Int).Add(td, header.Difficulty)
}
return len(headers), nil
}
// InsertChain injects a new batch of blocks into the simulated chain.
func (dl *downloadTester) InsertChain(blocks types.Blocks) (i int, err error) {
dl.lock.Lock()
defer dl.lock.Unlock()
for i, block := range blocks {
if parent, ok := dl.ownBlocks[block.ParentHash()]; !ok {
return i, fmt.Errorf("InsertChain: unknown parent at position %d / %d", i, len(blocks))
} else if _, err := dl.stateDb.Get(parent.Root().Bytes()); err != nil {
return i, fmt.Errorf("InsertChain: unknown parent state %x: %v", parent.Root(), err)
}
if hdr := dl.getHeaderByHash(block.Hash()); hdr == nil {
dl.ownHashes = append(dl.ownHashes, block.Hash())
dl.ownHeaders[block.Hash()] = block.Header()
}
dl.ownBlocks[block.Hash()] = block
dl.ownReceipts[block.Hash()] = make(types.Receipts, 0)
dl.stateDb.Put(block.Root().Bytes(), []byte{0x00})
td := dl.getTd(block.ParentHash())
dl.ownChainTd[block.Hash()] = new(big.Int).Add(td, block.Difficulty())
}
return len(blocks), nil
}
// InsertReceiptChain injects a new batch of receipts into the simulated chain.
func (dl *downloadTester) InsertReceiptChain(blocks types.Blocks, receipts []types.Receipts, ancientLimit uint64) (i int, err error) {
dl.lock.Lock()
defer dl.lock.Unlock()
for i := 0; i < len(blocks) && i < len(receipts); i++ {
if _, ok := dl.ownHeaders[blocks[i].Hash()]; !ok {
return i, errors.New("unknown owner")
}
if _, ok := dl.ancientBlocks[blocks[i].ParentHash()]; !ok {
if _, ok := dl.ownBlocks[blocks[i].ParentHash()]; !ok {
return i, errors.New("InsertReceiptChain: unknown parent")
}
}
if blocks[i].NumberU64() <= ancientLimit {
dl.ancientBlocks[blocks[i].Hash()] = blocks[i]
dl.ancientReceipts[blocks[i].Hash()] = receipts[i]
// Migrate from active db to ancient db
dl.ancientHeaders[blocks[i].Hash()] = blocks[i].Header()
dl.ancientChainTd[blocks[i].Hash()] = new(big.Int).Add(dl.ancientChainTd[blocks[i].ParentHash()], blocks[i].Difficulty())
delete(dl.ownHeaders, blocks[i].Hash())
delete(dl.ownChainTd, blocks[i].Hash())
} else {
dl.ownBlocks[blocks[i].Hash()] = blocks[i]
dl.ownReceipts[blocks[i].Hash()] = receipts[i]
}
}
return len(blocks), nil
}
// SetHead rewinds the local chain to a new head.
func (dl *downloadTester) SetHead(head uint64) error {
dl.lock.Lock()
defer dl.lock.Unlock()
// Find the hash of the head to reset to
var hash common.Hash
for h, header := range dl.ownHeaders {
if header.Number.Uint64() == head {
hash = h
}
}
for h, header := range dl.ancientHeaders {
if header.Number.Uint64() == head {
hash = h
}
}
if hash == (common.Hash{}) {
return fmt.Errorf("unknown head to set: %d", head)
}
// Find the offset in the header chain
var offset int
for o, h := range dl.ownHashes {
if h == hash {
offset = o
break
}
}
// Remove all the hashes and associated data afterwards
for i := offset + 1; i < len(dl.ownHashes); i++ {
delete(dl.ownChainTd, dl.ownHashes[i])
delete(dl.ownHeaders, dl.ownHashes[i])
delete(dl.ownReceipts, dl.ownHashes[i])
delete(dl.ownBlocks, dl.ownHashes[i])
delete(dl.ancientChainTd, dl.ownHashes[i])
delete(dl.ancientHeaders, dl.ownHashes[i])
delete(dl.ancientReceipts, dl.ownHashes[i])
delete(dl.ancientBlocks, dl.ownHashes[i])
}
dl.ownHashes = dl.ownHashes[:offset+1]
return nil
}
// Rollback removes some recently added elements from the chain.
func (dl *downloadTester) Rollback(hashes []common.Hash) {
}
// newPeer registers a new block download source into the downloader.
func (dl *downloadTester) newPeer(id string, version int, chain *testChain) error {
dl.lock.Lock()
defer dl.lock.Unlock()
peer := &downloadTesterPeer{dl: dl, id: id, chain: chain}
dl.peers[id] = peer
return dl.downloader.RegisterPeer(id, version, peer)
}
// dropPeer simulates a hard peer removal from the connection pool.
func (dl *downloadTester) dropPeer(id string) {
dl.lock.Lock()
defer dl.lock.Unlock()
delete(dl.peers, id)
dl.downloader.UnregisterPeer(id)
}
type downloadTesterPeer struct {
dl *downloadTester
id string
lock sync.RWMutex
chain *testChain
missingStates map[common.Hash]bool // State entries that fast sync should not return
}
// Head constructs a function to retrieve a peer's current head hash
// and total difficulty.
func (dlp *downloadTesterPeer) Head() (common.Hash, *big.Int) {
b := dlp.chain.headBlock()
return b.Hash(), dlp.chain.td(b.Hash())
}
// RequestHeadersByHash constructs a GetBlockHeaders function based on a hashed
// origin; associated with a particular peer in the download tester. The returned
// function can be used to retrieve batches of headers from the particular peer.
func (dlp *downloadTesterPeer) RequestHeadersByHash(origin common.Hash, amount int, skip int, reverse bool) error {
if reverse {
panic("reverse header requests not supported")
}
result := dlp.chain.headersByHash(origin, amount, skip)
go dlp.dl.downloader.DeliverHeaders(dlp.id, result)
return nil
}
// RequestHeadersByNumber constructs a GetBlockHeaders function based on a numbered
// origin; associated with a particular peer in the download tester. The returned
// function can be used to retrieve batches of headers from the particular peer.
func (dlp *downloadTesterPeer) RequestHeadersByNumber(origin uint64, amount int, skip int, reverse bool) error {
if reverse {
panic("reverse header requests not supported")
}
result := dlp.chain.headersByNumber(origin, amount, skip)
go dlp.dl.downloader.DeliverHeaders(dlp.id, result)
return nil
}
// RequestBodies constructs a getBlockBodies method associated with a particular
// peer in the download tester. The returned function can be used to retrieve
// batches of block bodies from the particularly requested peer.
func (dlp *downloadTesterPeer) RequestBodies(hashes []common.Hash) error {
txs, uncles := dlp.chain.bodies(hashes)
go dlp.dl.downloader.DeliverBodies(dlp.id, txs, uncles)
return nil
}
// RequestReceipts constructs a getReceipts method associated with a particular
// peer in the download tester. The returned function can be used to retrieve
// batches of block receipts from the particularly requested peer.
func (dlp *downloadTesterPeer) RequestReceipts(hashes []common.Hash) error {
receipts := dlp.chain.receipts(hashes)
go dlp.dl.downloader.DeliverReceipts(dlp.id, receipts)
return nil
}
// RequestNodeData constructs a getNodeData method associated with a particular
// peer in the download tester. The returned function can be used to retrieve
// batches of node state data from the particularly requested peer.
func (dlp *downloadTesterPeer) RequestNodeData(hashes []common.Hash) error {
dlp.dl.lock.RLock()
defer dlp.dl.lock.RUnlock()
results := make([][]byte, 0, len(hashes))
for _, hash := range hashes {
if data, err := dlp.dl.peerDb.Get(hash.Bytes()); err == nil {
if !dlp.missingStates[hash] {
results = append(results, data)
}
}
}
go dlp.dl.downloader.DeliverNodeData(dlp.id, results)
return nil
}
// assertOwnChain checks if the local chain contains the correct number of items
// of the various chain components.
func assertOwnChain(t *testing.T, tester *downloadTester, length int) {
// Mark this method as a helper to report errors at callsite, not in here
t.Helper()
assertOwnForkedChain(t, tester, 1, []int{length})
}
// assertOwnForkedChain checks if the local forked chain contains the correct
// number of items of the various chain components.
func assertOwnForkedChain(t *testing.T, tester *downloadTester, common int, lengths []int) {
// Mark this method as a helper to report errors at callsite, not in here
t.Helper()
// Initialize the counters for the first fork
headers, blocks, receipts := lengths[0], lengths[0], lengths[0]
// Update the counters for each subsequent fork
for _, length := range lengths[1:] {
headers += length - common
blocks += length - common
receipts += length - common
}
if tester.downloader.getMode() == LightSync {
blocks, receipts = 1, 1
}
if hs := len(tester.ownHeaders) + len(tester.ancientHeaders) - 1; hs != headers {
t.Fatalf("synchronised headers mismatch: have %v, want %v", hs, headers)
}
if bs := len(tester.ownBlocks) + len(tester.ancientBlocks) - 1; bs != blocks {
t.Fatalf("synchronised blocks mismatch: have %v, want %v", bs, blocks)
}
if rs := len(tester.ownReceipts) + len(tester.ancientReceipts) - 1; rs != receipts {
t.Fatalf("synchronised receipts mismatch: have %v, want %v", rs, receipts)
}
}
// Tests that simple synchronization against a canonical chain works correctly.
// In this test common ancestor lookup should be short circuited and not require
// binary searching.
func TestCanonicalSynchronisation63Full(t *testing.T) { testCanonicalSynchronisation(t, 63, FullSync) }
func TestCanonicalSynchronisation63Fast(t *testing.T) { testCanonicalSynchronisation(t, 63, FastSync) }
func TestCanonicalSynchronisation64Full(t *testing.T) { testCanonicalSynchronisation(t, 64, FullSync) }
func TestCanonicalSynchronisation64Fast(t *testing.T) { testCanonicalSynchronisation(t, 64, FastSync) }
func TestCanonicalSynchronisation65Full(t *testing.T) { testCanonicalSynchronisation(t, 65, FullSync) }
func TestCanonicalSynchronisation65Fast(t *testing.T) { testCanonicalSynchronisation(t, 65, FastSync) }
func TestCanonicalSynchronisation65Light(t *testing.T) {
testCanonicalSynchronisation(t, 65, LightSync)
}
func testCanonicalSynchronisation(t *testing.T, protocol int, mode SyncMode) {
t.Parallel()
tester := newTester()
defer tester.terminate()
// Create a small enough block chain to download
chain := testChainBase.shorten(blockCacheMaxItems - 15)
tester.newPeer("peer", protocol, chain)
// Synchronise with the peer and make sure all relevant data was retrieved
if err := tester.sync("peer", nil, mode); err != nil {
t.Fatalf("failed to synchronise blocks: %v", err)
}
assertOwnChain(t, tester, chain.len())
}
// Tests that if a large batch of blocks are being downloaded, it is throttled
// until the cached blocks are retrieved.
func TestThrottling63Full(t *testing.T) { testThrottling(t, 63, FullSync) }
func TestThrottling63Fast(t *testing.T) { testThrottling(t, 63, FastSync) }
func TestThrottling64Full(t *testing.T) { testThrottling(t, 64, FullSync) }
func TestThrottling64Fast(t *testing.T) { testThrottling(t, 64, FastSync) }
func TestThrottling65Full(t *testing.T) { testThrottling(t, 65, FullSync) }
func TestThrottling65Fast(t *testing.T) { testThrottling(t, 65, FastSync) }
func testThrottling(t *testing.T, protocol int, mode SyncMode) {
t.Parallel()
tester := newTester()
// Create a long block chain to download and the tester
targetBlocks := testChainBase.len() - 1
tester.newPeer("peer", protocol, testChainBase)
// Wrap the importer to allow stepping
blocked, proceed := uint32(0), make(chan struct{})
tester.downloader.chainInsertHook = func(results []*fetchResult) {
atomic.StoreUint32(&blocked, uint32(len(results)))
<-proceed
}
// Start a synchronisation concurrently
errc := make(chan error)
go func() {
errc <- tester.sync("peer", nil, mode)
}()
// Iteratively take some blocks, always checking the retrieval count
for {
// Check the retrieval count synchronously (! reason for this ugly block)
tester.lock.RLock()
retrieved := len(tester.ownBlocks)
tester.lock.RUnlock()
if retrieved >= targetBlocks+1 {
break
}
// Wait a bit for sync to throttle itself
var cached, frozen int
for start := time.Now(); time.Since(start) < 3*time.Second; {
time.Sleep(25 * time.Millisecond)
tester.lock.Lock()
{
tester.downloader.queue.resultCache.lock.Lock()
cached = tester.downloader.queue.resultCache.countCompleted()
tester.downloader.queue.resultCache.lock.Unlock()
frozen = int(atomic.LoadUint32(&blocked))
retrieved = len(tester.ownBlocks)
}
tester.lock.Unlock()
if cached == blockCacheMaxItems ||
cached == blockCacheMaxItems-reorgProtHeaderDelay ||
retrieved+cached+frozen == targetBlocks+1 ||
retrieved+cached+frozen == targetBlocks+1-reorgProtHeaderDelay {
break
}
}
// Make sure we filled up the cache, then exhaust it
time.Sleep(25 * time.Millisecond) // give it a chance to screw up
tester.lock.RLock()
retrieved = len(tester.ownBlocks)
tester.lock.RUnlock()
if cached != blockCacheMaxItems && cached != blockCacheMaxItems-reorgProtHeaderDelay && retrieved+cached+frozen != targetBlocks+1 && retrieved+cached+frozen != targetBlocks+1-reorgProtHeaderDelay {
t.Fatalf("block count mismatch: have %v, want %v (owned %v, blocked %v, target %v)", cached, blockCacheMaxItems, retrieved, frozen, targetBlocks+1)
}
// Permit the blocked blocks to import
if atomic.LoadUint32(&blocked) > 0 {
atomic.StoreUint32(&blocked, uint32(0))
proceed <- struct{}{}
}
}
// Check that we haven't pulled more blocks than available
assertOwnChain(t, tester, targetBlocks+1)
if err := <-errc; err != nil {
t.Fatalf("block synchronization failed: %v", err)
}
tester.terminate()
}
// Tests that simple synchronization against a forked chain works correctly. In
// this test common ancestor lookup should *not* be short circuited, and a full
// binary search should be executed.
func TestForkedSync63Full(t *testing.T) { testForkedSync(t, 63, FullSync) }
func TestForkedSync63Fast(t *testing.T) { testForkedSync(t, 63, FastSync) }
func TestForkedSync64Full(t *testing.T) { testForkedSync(t, 64, FullSync) }
func TestForkedSync64Fast(t *testing.T) { testForkedSync(t, 64, FastSync) }
func TestForkedSync65Full(t *testing.T) { testForkedSync(t, 65, FullSync) }
func TestForkedSync65Fast(t *testing.T) { testForkedSync(t, 65, FastSync) }
func TestForkedSync65Light(t *testing.T) { testForkedSync(t, 65, LightSync) }
func testForkedSync(t *testing.T, protocol int, mode SyncMode) {
t.Parallel()
tester := newTester()
defer tester.terminate()
chainA := testChainForkLightA.shorten(testChainBase.len() + 80)
chainB := testChainForkLightB.shorten(testChainBase.len() + 80)
tester.newPeer("fork A", protocol, chainA)
tester.newPeer("fork B", protocol, chainB)
// Synchronise with the peer and make sure all blocks were retrieved
if err := tester.sync("fork A", nil, mode); err != nil {
t.Fatalf("failed to synchronise blocks: %v", err)
}
assertOwnChain(t, tester, chainA.len())
// Synchronise with the second peer and make sure that fork is pulled too
if err := tester.sync("fork B", nil, mode); err != nil {
t.Fatalf("failed to synchronise blocks: %v", err)
}
assertOwnForkedChain(t, tester, testChainBase.len(), []int{chainA.len(), chainB.len()})
}
// Tests that synchronising against a much shorter but much heavyer fork works
// corrently and is not dropped.
func TestHeavyForkedSync63Full(t *testing.T) { testHeavyForkedSync(t, 63, FullSync) }
func TestHeavyForkedSync63Fast(t *testing.T) { testHeavyForkedSync(t, 63, FastSync) }
func TestHeavyForkedSync64Full(t *testing.T) { testHeavyForkedSync(t, 64, FullSync) }
func TestHeavyForkedSync64Fast(t *testing.T) { testHeavyForkedSync(t, 64, FastSync) }
func TestHeavyForkedSync65Full(t *testing.T) { testHeavyForkedSync(t, 65, FullSync) }
func TestHeavyForkedSync65Fast(t *testing.T) { testHeavyForkedSync(t, 65, FastSync) }
func TestHeavyForkedSync65Light(t *testing.T) { testHeavyForkedSync(t, 65, LightSync) }
func testHeavyForkedSync(t *testing.T, protocol int, mode SyncMode) {
t.Parallel()
tester := newTester()
defer tester.terminate()
chainA := testChainForkLightA.shorten(testChainBase.len() + 80)
chainB := testChainForkHeavy.shorten(testChainBase.len() + 80)
tester.newPeer("light", protocol, chainA)
tester.newPeer("heavy", protocol, chainB)
// Synchronise with the peer and make sure all blocks were retrieved
if err := tester.sync("light", nil, mode); err != nil {
t.Fatalf("failed to synchronise blocks: %v", err)
}
assertOwnChain(t, tester, chainA.len())
// Synchronise with the second peer and make sure that fork is pulled too
if err := tester.sync("heavy", nil, mode); err != nil {
t.Fatalf("failed to synchronise blocks: %v", err)
}
assertOwnForkedChain(t, tester, testChainBase.len(), []int{chainA.len(), chainB.len()})
}
// Tests that chain forks are contained within a certain interval of the current
// chain head, ensuring that malicious peers cannot waste resources by feeding
// long dead chains.
func TestBoundedForkedSync63Full(t *testing.T) { testBoundedForkedSync(t, 63, FullSync) }
func TestBoundedForkedSync63Fast(t *testing.T) { testBoundedForkedSync(t, 63, FastSync) }
func TestBoundedForkedSync64Full(t *testing.T) { testBoundedForkedSync(t, 64, FullSync) }
func TestBoundedForkedSync64Fast(t *testing.T) { testBoundedForkedSync(t, 64, FastSync) }
func TestBoundedForkedSync65Full(t *testing.T) { testBoundedForkedSync(t, 65, FullSync) }
func TestBoundedForkedSync65Fast(t *testing.T) { testBoundedForkedSync(t, 65, FastSync) }
func TestBoundedForkedSync65Light(t *testing.T) { testBoundedForkedSync(t, 65, LightSync) }
func testBoundedForkedSync(t *testing.T, protocol int, mode SyncMode) {
t.Parallel()
tester := newTester()
defer tester.terminate()
chainA := testChainForkLightA
chainB := testChainForkLightB
tester.newPeer("original", protocol, chainA)
tester.newPeer("rewriter", protocol, chainB)
// Synchronise with the peer and make sure all blocks were retrieved
if err := tester.sync("original", nil, mode); err != nil {
t.Fatalf("failed to synchronise blocks: %v", err)
}
assertOwnChain(t, tester, chainA.len())
// Synchronise with the second peer and ensure that the fork is rejected to being too old
if err := tester.sync("rewriter", nil, mode); err != errInvalidAncestor {
t.Fatalf("sync failure mismatch: have %v, want %v", err, errInvalidAncestor)
}
}
// Tests that chain forks are contained within a certain interval of the current
// chain head for short but heavy forks too. These are a bit special because they
// take different ancestor lookup paths.
func TestBoundedHeavyForkedSync63Full(t *testing.T) { testBoundedHeavyForkedSync(t, 63, FullSync) }
func TestBoundedHeavyForkedSync63Fast(t *testing.T) { testBoundedHeavyForkedSync(t, 63, FastSync) }
func TestBoundedHeavyForkedSync64Full(t *testing.T) { testBoundedHeavyForkedSync(t, 64, FullSync) }
func TestBoundedHeavyForkedSync64Fast(t *testing.T) { testBoundedHeavyForkedSync(t, 64, FastSync) }
func TestBoundedHeavyForkedSync65Full(t *testing.T) { testBoundedHeavyForkedSync(t, 65, FullSync) }
func TestBoundedHeavyForkedSync65Fast(t *testing.T) { testBoundedHeavyForkedSync(t, 65, FastSync) }
func TestBoundedHeavyForkedSync65Light(t *testing.T) { testBoundedHeavyForkedSync(t, 65, LightSync) }
func testBoundedHeavyForkedSync(t *testing.T, protocol int, mode SyncMode) {
t.Parallel()
tester := newTester()
// Create a long enough forked chain
chainA := testChainForkLightA
chainB := testChainForkHeavy
tester.newPeer("original", protocol, chainA)
// Synchronise with the peer and make sure all blocks were retrieved
if err := tester.sync("original", nil, mode); err != nil {
t.Fatalf("failed to synchronise blocks: %v", err)
}
assertOwnChain(t, tester, chainA.len())
tester.newPeer("heavy-rewriter", protocol, chainB)
// Synchronise with the second peer and ensure that the fork is rejected to being too old
if err := tester.sync("heavy-rewriter", nil, mode); err != errInvalidAncestor {
t.Fatalf("sync failure mismatch: have %v, want %v", err, errInvalidAncestor)
}
tester.terminate()
}
// Tests that an inactive downloader will not accept incoming block headers,
// bodies and receipts.
func TestInactiveDownloader63(t *testing.T) {
t.Parallel()
tester := newTester()
defer tester.terminate()
// Check that neither block headers nor bodies are accepted
if err := tester.downloader.DeliverHeaders("bad peer", []*types.Header{}); err != errNoSyncActive {
t.Errorf("error mismatch: have %v, want %v", err, errNoSyncActive)
}
if err := tester.downloader.DeliverBodies("bad peer", [][]*types.Transaction{}, [][]*types.Header{}); err != errNoSyncActive {
t.Errorf("error mismatch: have %v, want %v", err, errNoSyncActive)
}
if err := tester.downloader.DeliverReceipts("bad peer", [][]*types.Receipt{}); err != errNoSyncActive {
t.Errorf("error mismatch: have %v, want %v", err, errNoSyncActive)
}
}
// Tests that a canceled download wipes all previously accumulated state.
func TestCancel63Full(t *testing.T) { testCancel(t, 63, FullSync) }
func TestCancel63Fast(t *testing.T) { testCancel(t, 63, FastSync) }
func TestCancel64Full(t *testing.T) { testCancel(t, 64, FullSync) }
func TestCancel64Fast(t *testing.T) { testCancel(t, 64, FastSync) }
func TestCancel65Full(t *testing.T) { testCancel(t, 65, FullSync) }
func TestCancel65Fast(t *testing.T) { testCancel(t, 65, FastSync) }
func TestCancel65Light(t *testing.T) { testCancel(t, 65, LightSync) }
func testCancel(t *testing.T, protocol int, mode SyncMode) {
t.Parallel()
tester := newTester()
defer tester.terminate()
chain := testChainBase.shorten(MaxHeaderFetch)
tester.newPeer("peer", protocol, chain)
// Make sure canceling works with a pristine downloader
tester.downloader.Cancel()
if !tester.downloader.queue.Idle() {
t.Errorf("download queue not idle")
}
// Synchronise with the peer, but cancel afterwards
if err := tester.sync("peer", nil, mode); err != nil {
t.Fatalf("failed to synchronise blocks: %v", err)
}
tester.downloader.Cancel()
if !tester.downloader.queue.Idle() {
t.Errorf("download queue not idle")
}
}
// Tests that synchronisation from multiple peers works as intended (multi thread sanity test).
func TestMultiSynchronisation63Full(t *testing.T) { testMultiSynchronisation(t, 63, FullSync) }
func TestMultiSynchronisation63Fast(t *testing.T) { testMultiSynchronisation(t, 63, FastSync) }
func TestMultiSynchronisation64Full(t *testing.T) { testMultiSynchronisation(t, 64, FullSync) }
func TestMultiSynchronisation64Fast(t *testing.T) { testMultiSynchronisation(t, 64, FastSync) }
func TestMultiSynchronisation65Full(t *testing.T) { testMultiSynchronisation(t, 65, FullSync) }
func TestMultiSynchronisation65Fast(t *testing.T) { testMultiSynchronisation(t, 65, FastSync) }
func TestMultiSynchronisation65Light(t *testing.T) { testMultiSynchronisation(t, 65, LightSync) }
func testMultiSynchronisation(t *testing.T, protocol int, mode SyncMode) {
t.Parallel()
tester := newTester()
defer tester.terminate()
// Create various peers with various parts of the chain
targetPeers := 8
chain := testChainBase.shorten(targetPeers * 100)
for i := 0; i < targetPeers; i++ {
id := fmt.Sprintf("peer #%d", i)
tester.newPeer(id, protocol, chain.shorten(chain.len()/(i+1)))
}
if err := tester.sync("peer #0", nil, mode); err != nil {
t.Fatalf("failed to synchronise blocks: %v", err)
}
assertOwnChain(t, tester, chain.len())
}
// Tests that synchronisations behave well in multi-version protocol environments
// and not wreak havoc on other nodes in the network.
func TestMultiProtoSynchronisation63Full(t *testing.T) { testMultiProtoSync(t, 63, FullSync) }
func TestMultiProtoSynchronisation63Fast(t *testing.T) { testMultiProtoSync(t, 63, FastSync) }
func TestMultiProtoSynchronisation64Full(t *testing.T) { testMultiProtoSync(t, 64, FullSync) }
func TestMultiProtoSynchronisation64Fast(t *testing.T) { testMultiProtoSync(t, 64, FastSync) }
func TestMultiProtoSynchronisation65Full(t *testing.T) { testMultiProtoSync(t, 65, FullSync) }
func TestMultiProtoSynchronisation65Fast(t *testing.T) { testMultiProtoSync(t, 65, FastSync) }
func TestMultiProtoSynchronisation65Light(t *testing.T) { testMultiProtoSync(t, 65, LightSync) }
func testMultiProtoSync(t *testing.T, protocol int, mode SyncMode) {
t.Parallel()
tester := newTester()
defer tester.terminate()
// Create a small enough block chain to download
chain := testChainBase.shorten(blockCacheMaxItems - 15)
// Create peers of every type
tester.newPeer("peer 63", 63, chain)
tester.newPeer("peer 64", 64, chain)
tester.newPeer("peer 65", 65, chain)
// Synchronise with the requested peer and make sure all blocks were retrieved
if err := tester.sync(fmt.Sprintf("peer %d", protocol), nil, mode); err != nil {
t.Fatalf("failed to synchronise blocks: %v", err)
}
assertOwnChain(t, tester, chain.len())
// Check that no peers have been dropped off
for _, version := range []int{63, 64, 65} {
peer := fmt.Sprintf("peer %d", version)
if _, ok := tester.peers[peer]; !ok {
t.Errorf("%s dropped", peer)
}
}
}
// Tests that if a block is empty (e.g. header only), no body request should be
// made, and instead the header should be assembled into a whole block in itself.
func TestEmptyShortCircuit63Full(t *testing.T) { testEmptyShortCircuit(t, 63, FullSync) }
func TestEmptyShortCircuit63Fast(t *testing.T) { testEmptyShortCircuit(t, 63, FastSync) }
func TestEmptyShortCircuit64Full(t *testing.T) { testEmptyShortCircuit(t, 64, FullSync) }
func TestEmptyShortCircuit64Fast(t *testing.T) { testEmptyShortCircuit(t, 64, FastSync) }
func TestEmptyShortCircuit65Full(t *testing.T) { testEmptyShortCircuit(t, 65, FullSync) }
func TestEmptyShortCircuit65Fast(t *testing.T) { testEmptyShortCircuit(t, 65, FastSync) }
func TestEmptyShortCircuit65Light(t *testing.T) { testEmptyShortCircuit(t, 65, LightSync) }
func testEmptyShortCircuit(t *testing.T, protocol int, mode SyncMode) {
t.Parallel()
tester := newTester()
defer tester.terminate()
// Create a block chain to download
chain := testChainBase
tester.newPeer("peer", protocol, chain)
// Instrument the downloader to signal body requests
bodiesHave, receiptsHave := int32(0), int32(0)
tester.downloader.bodyFetchHook = func(headers []*types.Header) {
atomic.AddInt32(&bodiesHave, int32(len(headers)))
}
tester.downloader.receiptFetchHook = func(headers []*types.Header) {
atomic.AddInt32(&receiptsHave, int32(len(headers)))
}
// Synchronise with the peer and make sure all blocks were retrieved
if err := tester.sync("peer", nil, mode); err != nil {
t.Fatalf("failed to synchronise blocks: %v", err)
}
assertOwnChain(t, tester, chain.len())
// Validate the number of block bodies that should have been requested
bodiesNeeded, receiptsNeeded := 0, 0
for _, block := range chain.blockm {
if mode != LightSync && block != tester.genesis && (len(block.Transactions()) > 0 || len(block.Uncles()) > 0) {
bodiesNeeded++
}
}
for _, receipt := range chain.receiptm {
if mode == FastSync && len(receipt) > 0 {
receiptsNeeded++
}
}
if int(bodiesHave) != bodiesNeeded {
t.Errorf("body retrieval count mismatch: have %v, want %v", bodiesHave, bodiesNeeded)
}
if int(receiptsHave) != receiptsNeeded {
t.Errorf("receipt retrieval count mismatch: have %v, want %v", receiptsHave, receiptsNeeded)
}
}
// Tests that headers are enqueued continuously, preventing malicious nodes from
// stalling the downloader by feeding gapped header chains.
func TestMissingHeaderAttack63Full(t *testing.T) { testMissingHeaderAttack(t, 63, FullSync) }
func TestMissingHeaderAttack63Fast(t *testing.T) { testMissingHeaderAttack(t, 63, FastSync) }
func TestMissingHeaderAttack64Full(t *testing.T) { testMissingHeaderAttack(t, 64, FullSync) }
func TestMissingHeaderAttack64Fast(t *testing.T) { testMissingHeaderAttack(t, 64, FastSync) }
func TestMissingHeaderAttack65Full(t *testing.T) { testMissingHeaderAttack(t, 65, FullSync) }
func TestMissingHeaderAttack65Fast(t *testing.T) { testMissingHeaderAttack(t, 65, FastSync) }
func TestMissingHeaderAttack65Light(t *testing.T) { testMissingHeaderAttack(t, 65, LightSync) }
func testMissingHeaderAttack(t *testing.T, protocol int, mode SyncMode) {
t.Parallel()
tester := newTester()
defer tester.terminate()
chain := testChainBase.shorten(blockCacheMaxItems - 15)
brokenChain := chain.shorten(chain.len())
delete(brokenChain.headerm, brokenChain.chain[brokenChain.len()/2])
tester.newPeer("attack", protocol, brokenChain)
if err := tester.sync("attack", nil, mode); err == nil {
t.Fatalf("succeeded attacker synchronisation")
}
// Synchronise with the valid peer and make sure sync succeeds
tester.newPeer("valid", protocol, chain)
if err := tester.sync("valid", nil, mode); err != nil {
t.Fatalf("failed to synchronise blocks: %v", err)
}
assertOwnChain(t, tester, chain.len())
}
// Tests that if requested headers are shifted (i.e. first is missing), the queue
// detects the invalid numbering.
func TestShiftedHeaderAttack63Full(t *testing.T) { testShiftedHeaderAttack(t, 63, FullSync) }
func TestShiftedHeaderAttack63Fast(t *testing.T) { testShiftedHeaderAttack(t, 63, FastSync) }
func TestShiftedHeaderAttack64Full(t *testing.T) { testShiftedHeaderAttack(t, 64, FullSync) }
func TestShiftedHeaderAttack64Fast(t *testing.T) { testShiftedHeaderAttack(t, 64, FastSync) }
func TestShiftedHeaderAttack65Full(t *testing.T) { testShiftedHeaderAttack(t, 65, FullSync) }
func TestShiftedHeaderAttack65Fast(t *testing.T) { testShiftedHeaderAttack(t, 65, FastSync) }
func TestShiftedHeaderAttack65Light(t *testing.T) { testShiftedHeaderAttack(t, 65, LightSync) }
func testShiftedHeaderAttack(t *testing.T, protocol int, mode SyncMode) {
t.Parallel()
tester := newTester()
defer tester.terminate()
chain := testChainBase.shorten(blockCacheMaxItems - 15)
// Attempt a full sync with an attacker feeding shifted headers
brokenChain := chain.shorten(chain.len())
delete(brokenChain.headerm, brokenChain.chain[1])
delete(brokenChain.blockm, brokenChain.chain[1])
delete(brokenChain.receiptm, brokenChain.chain[1])
tester.newPeer("attack", protocol, brokenChain)
if err := tester.sync("attack", nil, mode); err == nil {
t.Fatalf("succeeded attacker synchronisation")
}
// Synchronise with the valid peer and make sure sync succeeds
tester.newPeer("valid", protocol, chain)
if err := tester.sync("valid", nil, mode); err != nil {
t.Fatalf("failed to synchronise blocks: %v", err)
}
assertOwnChain(t, tester, chain.len())
}
// Tests that upon detecting an invalid header, the recent ones are rolled back
// for various failure scenarios. Afterwards a full sync is attempted to make
// sure no state was corrupted.
func TestInvalidHeaderRollback63Fast(t *testing.T) { testInvalidHeaderRollback(t, 63, FastSync) }
func TestInvalidHeaderRollback64Fast(t *testing.T) { testInvalidHeaderRollback(t, 64, FastSync) }
func TestInvalidHeaderRollback65Fast(t *testing.T) { testInvalidHeaderRollback(t, 65, FastSync) }
func TestInvalidHeaderRollback65Light(t *testing.T) { testInvalidHeaderRollback(t, 65, LightSync) }
func testInvalidHeaderRollback(t *testing.T, protocol int, mode SyncMode) {
t.Parallel()
tester := newTester()
// Create a small enough block chain to download
targetBlocks := 3*fsHeaderSafetyNet + 256 + fsMinFullBlocks
chain := testChainBase.shorten(targetBlocks)
// Attempt to sync with an attacker that feeds junk during the fast sync phase.
// This should result in the last fsHeaderSafetyNet headers being rolled back.
missing := fsHeaderSafetyNet + MaxHeaderFetch + 1
fastAttackChain := chain.shorten(chain.len())
delete(fastAttackChain.headerm, fastAttackChain.chain[missing])
tester.newPeer("fast-attack", protocol, fastAttackChain)
if err := tester.sync("fast-attack", nil, mode); err == nil {
t.Fatalf("succeeded fast attacker synchronisation")
}
if head := tester.CurrentHeader().Number.Int64(); int(head) > MaxHeaderFetch {
t.Errorf("rollback head mismatch: have %v, want at most %v", head, MaxHeaderFetch)
}
// Attempt to sync with an attacker that feeds junk during the block import phase.
// This should result in both the last fsHeaderSafetyNet number of headers being
// rolled back, and also the pivot point being reverted to a non-block status.
missing = 3*fsHeaderSafetyNet + MaxHeaderFetch + 1
blockAttackChain := chain.shorten(chain.len())
delete(fastAttackChain.headerm, fastAttackChain.chain[missing]) // Make sure the fast-attacker doesn't fill in
delete(blockAttackChain.headerm, blockAttackChain.chain[missing])
tester.newPeer("block-attack", protocol, blockAttackChain)
if err := tester.sync("block-attack", nil, mode); err == nil {
t.Fatalf("succeeded block attacker synchronisation")
}
if head := tester.CurrentHeader().Number.Int64(); int(head) > 2*fsHeaderSafetyNet+MaxHeaderFetch {
t.Errorf("rollback head mismatch: have %v, want at most %v", head, 2*fsHeaderSafetyNet+MaxHeaderFetch)
}
if mode == FastSync {
if head := tester.CurrentBlock().NumberU64(); head != 0 {
t.Errorf("fast sync pivot block #%d not rolled back", head)
}
}
// Attempt to sync with an attacker that withholds promised blocks after the
// fast sync pivot point. This could be a trial to leave the node with a bad
// but already imported pivot block.
withholdAttackChain := chain.shorten(chain.len())
tester.newPeer("withhold-attack", protocol, withholdAttackChain)
tester.downloader.syncInitHook = func(uint64, uint64) {
for i := missing; i < withholdAttackChain.len(); i++ {
delete(withholdAttackChain.headerm, withholdAttackChain.chain[i])
}
tester.downloader.syncInitHook = nil
}
if err := tester.sync("withhold-attack", nil, mode); err == nil {
t.Fatalf("succeeded withholding attacker synchronisation")
}
if head := tester.CurrentHeader().Number.Int64(); int(head) > 2*fsHeaderSafetyNet+MaxHeaderFetch {
t.Errorf("rollback head mismatch: have %v, want at most %v", head, 2*fsHeaderSafetyNet+MaxHeaderFetch)
}
if mode == FastSync {
if head := tester.CurrentBlock().NumberU64(); head != 0 {
t.Errorf("fast sync pivot block #%d not rolled back", head)
}
}
// synchronise with the valid peer and make sure sync succeeds. Since the last rollback
// should also disable fast syncing for this process, verify that we did a fresh full
// sync. Note, we can't assert anything about the receipts since we won't purge the
// database of them, hence we can't use assertOwnChain.
tester.newPeer("valid", protocol, chain)
if err := tester.sync("valid", nil, mode); err != nil {
t.Fatalf("failed to synchronise blocks: %v", err)
}
if hs := len(tester.ownHeaders); hs != chain.len() {
t.Fatalf("synchronised headers mismatch: have %v, want %v", hs, chain.len())
}
if mode != LightSync {
if bs := len(tester.ownBlocks); bs != chain.len() {
t.Fatalf("synchronised blocks mismatch: have %v, want %v", bs, chain.len())
}
}
tester.terminate()
}
// Tests that a peer advertising a high TD doesn't get to stall the downloader
// afterwards by not sending any useful hashes.
func TestHighTDStarvationAttack63Full(t *testing.T) { testHighTDStarvationAttack(t, 63, FullSync) }
func TestHighTDStarvationAttack63Fast(t *testing.T) { testHighTDStarvationAttack(t, 63, FastSync) }
func TestHighTDStarvationAttack64Full(t *testing.T) { testHighTDStarvationAttack(t, 64, FullSync) }
func TestHighTDStarvationAttack64Fast(t *testing.T) { testHighTDStarvationAttack(t, 64, FastSync) }
func TestHighTDStarvationAttack65Full(t *testing.T) { testHighTDStarvationAttack(t, 65, FullSync) }
func TestHighTDStarvationAttack65Fast(t *testing.T) { testHighTDStarvationAttack(t, 65, FastSync) }
func TestHighTDStarvationAttack65Light(t *testing.T) { testHighTDStarvationAttack(t, 65, LightSync) }
func testHighTDStarvationAttack(t *testing.T, protocol int, mode SyncMode) {
t.Parallel()
tester := newTester()
chain := testChainBase.shorten(1)
tester.newPeer("attack", protocol, chain)
if err := tester.sync("attack", big.NewInt(1000000), mode); err != errStallingPeer {
t.Fatalf("synchronisation error mismatch: have %v, want %v", err, errStallingPeer)
}
tester.terminate()
}
// Tests that misbehaving peers are disconnected, whilst behaving ones are not.
func TestBlockHeaderAttackerDropping63(t *testing.T) { testBlockHeaderAttackerDropping(t, 63) }
func TestBlockHeaderAttackerDropping64(t *testing.T) { testBlockHeaderAttackerDropping(t, 64) }
func TestBlockHeaderAttackerDropping65(t *testing.T) { testBlockHeaderAttackerDropping(t, 65) }
func testBlockHeaderAttackerDropping(t *testing.T, protocol int) {
t.Parallel()
// Define the disconnection requirement for individual hash fetch errors
tests := []struct {
result error
drop bool
}{
{nil, false}, // Sync succeeded, all is well
{errBusy, false}, // Sync is already in progress, no problem
{errUnknownPeer, false}, // Peer is unknown, was already dropped, don't double drop
{errBadPeer, true}, // Peer was deemed bad for some reason, drop it
{errStallingPeer, true}, // Peer was detected to be stalling, drop it
{errUnsyncedPeer, true}, // Peer was detected to be unsynced, drop it
{errNoPeers, false}, // No peers to download from, soft race, no issue
{errTimeout, true}, // No hashes received in due time, drop the peer
{errEmptyHeaderSet, true}, // No headers were returned as a response, drop as it's a dead end
{errPeersUnavailable, true}, // Nobody had the advertised blocks, drop the advertiser
{errInvalidAncestor, true}, // Agreed upon ancestor is not acceptable, drop the chain rewriter
{errInvalidChain, true}, // Hash chain was detected as invalid, definitely drop
{errInvalidBody, false}, // A bad peer was detected, but not the sync origin
{errInvalidReceipt, false}, // A bad peer was detected, but not the sync origin
{errCancelContentProcessing, false}, // Synchronisation was canceled, origin may be innocent, don't drop
}
// Run the tests and check disconnection status
tester := newTester()
defer tester.terminate()
chain := testChainBase.shorten(1)
for i, tt := range tests {
// Register a new peer and ensure its presence
id := fmt.Sprintf("test %d", i)
if err := tester.newPeer(id, protocol, chain); err != nil {
t.Fatalf("test %d: failed to register new peer: %v", i, err)
}
if _, ok := tester.peers[id]; !ok {
t.Fatalf("test %d: registered peer not found", i)
}
// Simulate a synchronisation and check the required result
tester.downloader.synchroniseMock = func(string, common.Hash) error { return tt.result }
tester.downloader.Synchronise(id, tester.genesis.Hash(), big.NewInt(1000), FullSync)
if _, ok := tester.peers[id]; !ok != tt.drop {
t.Errorf("test %d: peer drop mismatch for %v: have %v, want %v", i, tt.result, !ok, tt.drop)
}
}
}
// Tests that synchronisation progress (origin block number, current block number
// and highest block number) is tracked and updated correctly.
func TestSyncProgress63Full(t *testing.T) { testSyncProgress(t, 63, FullSync) }
func TestSyncProgress63Fast(t *testing.T) { testSyncProgress(t, 63, FastSync) }
func TestSyncProgress64Full(t *testing.T) { testSyncProgress(t, 64, FullSync) }
func TestSyncProgress64Fast(t *testing.T) { testSyncProgress(t, 64, FastSync) }
func TestSyncProgress65Full(t *testing.T) { testSyncProgress(t, 65, FullSync) }
func TestSyncProgress65Fast(t *testing.T) { testSyncProgress(t, 65, FastSync) }
func TestSyncProgress65Light(t *testing.T) { testSyncProgress(t, 65, LightSync) }
func testSyncProgress(t *testing.T, protocol int, mode SyncMode) {
t.Parallel()
tester := newTester()
defer tester.terminate()
chain := testChainBase.shorten(blockCacheMaxItems - 15)
// Set a sync init hook to catch progress changes
starting := make(chan struct{})
progress := make(chan struct{})
tester.downloader.syncInitHook = func(origin, latest uint64) {
starting <- struct{}{}
<-progress
}
checkProgress(t, tester.downloader, "pristine", ethereum.SyncProgress{})
// Synchronise half the blocks and check initial progress
tester.newPeer("peer-half", protocol, chain.shorten(chain.len()/2))
pending := new(sync.WaitGroup)
pending.Add(1)
go func() {
defer pending.Done()
if err := tester.sync("peer-half", nil, mode); err != nil {
panic(fmt.Sprintf("failed to synchronise blocks: %v", err))
}
}()
<-starting
checkProgress(t, tester.downloader, "initial", ethereum.SyncProgress{
HighestBlock: uint64(chain.len()/2 - 1),
})
progress <- struct{}{}
pending.Wait()
// Synchronise all the blocks and check continuation progress
tester.newPeer("peer-full", protocol, chain)
pending.Add(1)
go func() {
defer pending.Done()
if err := tester.sync("peer-full", nil, mode); err != nil {
panic(fmt.Sprintf("failed to synchronise blocks: %v", err))
}
}()
<-starting
checkProgress(t, tester.downloader, "completing", ethereum.SyncProgress{
StartingBlock: uint64(chain.len()/2 - 1),
CurrentBlock: uint64(chain.len()/2 - 1),
HighestBlock: uint64(chain.len() - 1),
})
// Check final progress after successful sync
progress <- struct{}{}
pending.Wait()
checkProgress(t, tester.downloader, "final", ethereum.SyncProgress{
StartingBlock: uint64(chain.len()/2 - 1),
CurrentBlock: uint64(chain.len() - 1),
HighestBlock: uint64(chain.len() - 1),
})
}
func checkProgress(t *testing.T, d *Downloader, stage string, want ethereum.SyncProgress) {
// Mark this method as a helper to report errors at callsite, not in here
t.Helper()
p := d.Progress()
p.KnownStates, p.PulledStates = 0, 0
want.KnownStates, want.PulledStates = 0, 0
if p != want {
t.Fatalf("%s progress mismatch:\nhave %+v\nwant %+v", stage, p, want)
}
}
// Tests that synchronisation progress (origin block number and highest block
// number) is tracked and updated correctly in case of a fork (or manual head
// revertal).
func TestForkedSyncProgress63Full(t *testing.T) { testForkedSyncProgress(t, 63, FullSync) }
func TestForkedSyncProgress63Fast(t *testing.T) { testForkedSyncProgress(t, 63, FastSync) }
func TestForkedSyncProgress64Full(t *testing.T) { testForkedSyncProgress(t, 64, FullSync) }
func TestForkedSyncProgress64Fast(t *testing.T) { testForkedSyncProgress(t, 64, FastSync) }
func TestForkedSyncProgress65Full(t *testing.T) { testForkedSyncProgress(t, 65, FullSync) }
func TestForkedSyncProgress65Fast(t *testing.T) { testForkedSyncProgress(t, 65, FastSync) }
func TestForkedSyncProgress65Light(t *testing.T) { testForkedSyncProgress(t, 65, LightSync) }
func testForkedSyncProgress(t *testing.T, protocol int, mode SyncMode) {
t.Parallel()
tester := newTester()
defer tester.terminate()
chainA := testChainForkLightA.shorten(testChainBase.len() + MaxHashFetch)
chainB := testChainForkLightB.shorten(testChainBase.len() + MaxHashFetch)
// Set a sync init hook to catch progress changes
starting := make(chan struct{})
progress := make(chan struct{})
tester.downloader.syncInitHook = func(origin, latest uint64) {
starting <- struct{}{}
<-progress
}
checkProgress(t, tester.downloader, "pristine", ethereum.SyncProgress{})
// Synchronise with one of the forks and check progress
tester.newPeer("fork A", protocol, chainA)
pending := new(sync.WaitGroup)
pending.Add(1)
go func() {
defer pending.Done()
if err := tester.sync("fork A", nil, mode); err != nil {
panic(fmt.Sprintf("failed to synchronise blocks: %v", err))
}
}()
<-starting
checkProgress(t, tester.downloader, "initial", ethereum.SyncProgress{
HighestBlock: uint64(chainA.len() - 1),
})
progress <- struct{}{}
pending.Wait()
// Simulate a successful sync above the fork
tester.downloader.syncStatsChainOrigin = tester.downloader.syncStatsChainHeight
// Synchronise with the second fork and check progress resets
tester.newPeer("fork B", protocol, chainB)
pending.Add(1)
go func() {
defer pending.Done()
if err := tester.sync("fork B", nil, mode); err != nil {
panic(fmt.Sprintf("failed to synchronise blocks: %v", err))
}
}()
<-starting
checkProgress(t, tester.downloader, "forking", ethereum.SyncProgress{
StartingBlock: uint64(testChainBase.len()) - 1,
CurrentBlock: uint64(chainA.len() - 1),
HighestBlock: uint64(chainB.len() - 1),
})
// Check final progress after successful sync
progress <- struct{}{}
pending.Wait()
checkProgress(t, tester.downloader, "final", ethereum.SyncProgress{
StartingBlock: uint64(testChainBase.len()) - 1,
CurrentBlock: uint64(chainB.len() - 1),
HighestBlock: uint64(chainB.len() - 1),
})
}
// Tests that if synchronisation is aborted due to some failure, then the progress
// origin is not updated in the next sync cycle, as it should be considered the
// continuation of the previous sync and not a new instance.
func TestFailedSyncProgress63Full(t *testing.T) { testFailedSyncProgress(t, 63, FullSync) }
func TestFailedSyncProgress63Fast(t *testing.T) { testFailedSyncProgress(t, 63, FastSync) }
func TestFailedSyncProgress64Full(t *testing.T) { testFailedSyncProgress(t, 64, FullSync) }
func TestFailedSyncProgress64Fast(t *testing.T) { testFailedSyncProgress(t, 64, FastSync) }
func TestFailedSyncProgress65Full(t *testing.T) { testFailedSyncProgress(t, 65, FullSync) }
func TestFailedSyncProgress65Fast(t *testing.T) { testFailedSyncProgress(t, 65, FastSync) }
func TestFailedSyncProgress65Light(t *testing.T) { testFailedSyncProgress(t, 65, LightSync) }
func testFailedSyncProgress(t *testing.T, protocol int, mode SyncMode) {
t.Parallel()
tester := newTester()
defer tester.terminate()
chain := testChainBase.shorten(blockCacheMaxItems - 15)
// Set a sync init hook to catch progress changes
starting := make(chan struct{})
progress := make(chan struct{})
tester.downloader.syncInitHook = func(origin, latest uint64) {
starting <- struct{}{}
<-progress
}
checkProgress(t, tester.downloader, "pristine", ethereum.SyncProgress{})
// Attempt a full sync with a faulty peer
brokenChain := chain.shorten(chain.len())
missing := brokenChain.len() / 2
delete(brokenChain.headerm, brokenChain.chain[missing])
delete(brokenChain.blockm, brokenChain.chain[missing])
delete(brokenChain.receiptm, brokenChain.chain[missing])
tester.newPeer("faulty", protocol, brokenChain)
pending := new(sync.WaitGroup)
pending.Add(1)
go func() {
defer pending.Done()
if err := tester.sync("faulty", nil, mode); err == nil {
panic("succeeded faulty synchronisation")
}
}()
<-starting
checkProgress(t, tester.downloader, "initial", ethereum.SyncProgress{
HighestBlock: uint64(brokenChain.len() - 1),
})
progress <- struct{}{}
pending.Wait()
afterFailedSync := tester.downloader.Progress()
// Synchronise with a good peer and check that the progress origin remind the same
// after a failure
tester.newPeer("valid", protocol, chain)
pending.Add(1)
go func() {
defer pending.Done()
if err := tester.sync("valid", nil, mode); err != nil {
panic(fmt.Sprintf("failed to synchronise blocks: %v", err))
}
}()
<-starting
checkProgress(t, tester.downloader, "completing", afterFailedSync)
// Check final progress after successful sync
progress <- struct{}{}
pending.Wait()
checkProgress(t, tester.downloader, "final", ethereum.SyncProgress{
CurrentBlock: uint64(chain.len() - 1),
HighestBlock: uint64(chain.len() - 1),
})
}
// Tests that if an attacker fakes a chain height, after the attack is detected,
// the progress height is successfully reduced at the next sync invocation.
func TestFakedSyncProgress63Full(t *testing.T) { testFakedSyncProgress(t, 63, FullSync) }
func TestFakedSyncProgress63Fast(t *testing.T) { testFakedSyncProgress(t, 63, FastSync) }
func TestFakedSyncProgress64Full(t *testing.T) { testFakedSyncProgress(t, 64, FullSync) }
func TestFakedSyncProgress64Fast(t *testing.T) { testFakedSyncProgress(t, 64, FastSync) }
func TestFakedSyncProgress65Full(t *testing.T) { testFakedSyncProgress(t, 65, FullSync) }
func TestFakedSyncProgress65Fast(t *testing.T) { testFakedSyncProgress(t, 65, FastSync) }
func TestFakedSyncProgress65Light(t *testing.T) { testFakedSyncProgress(t, 65, LightSync) }
func testFakedSyncProgress(t *testing.T, protocol int, mode SyncMode) {
t.Parallel()
tester := newTester()
defer tester.terminate()
chain := testChainBase.shorten(blockCacheMaxItems - 15)
// Set a sync init hook to catch progress changes
starting := make(chan struct{})
progress := make(chan struct{})
tester.downloader.syncInitHook = func(origin, latest uint64) {
starting <- struct{}{}
<-progress
}
checkProgress(t, tester.downloader, "pristine", ethereum.SyncProgress{})
// Create and sync with an attacker that promises a higher chain than available.
brokenChain := chain.shorten(chain.len())
numMissing := 5
for i := brokenChain.len() - 2; i > brokenChain.len()-numMissing; i-- {
delete(brokenChain.headerm, brokenChain.chain[i])
}
tester.newPeer("attack", protocol, brokenChain)
pending := new(sync.WaitGroup)
pending.Add(1)
go func() {
defer pending.Done()
if err := tester.sync("attack", nil, mode); err == nil {
panic("succeeded attacker synchronisation")
}
}()
<-starting
checkProgress(t, tester.downloader, "initial", ethereum.SyncProgress{
HighestBlock: uint64(brokenChain.len() - 1),
})
progress <- struct{}{}
pending.Wait()
afterFailedSync := tester.downloader.Progress()
// Synchronise with a good peer and check that the progress height has been reduced to
// the true value.
validChain := chain.shorten(chain.len() - numMissing)
tester.newPeer("valid", protocol, validChain)
pending.Add(1)
go func() {
defer pending.Done()
if err := tester.sync("valid", nil, mode); err != nil {
panic(fmt.Sprintf("failed to synchronise blocks: %v", err))
}
}()
<-starting
checkProgress(t, tester.downloader, "completing", ethereum.SyncProgress{
CurrentBlock: afterFailedSync.CurrentBlock,
HighestBlock: uint64(validChain.len() - 1),
})
// Check final progress after successful sync.
progress <- struct{}{}
pending.Wait()
checkProgress(t, tester.downloader, "final", ethereum.SyncProgress{
CurrentBlock: uint64(validChain.len() - 1),
HighestBlock: uint64(validChain.len() - 1),
})
}
// This test reproduces an issue where unexpected deliveries would
// block indefinitely if they arrived at the right time.
func TestDeliverHeadersHang(t *testing.T) {
t.Parallel()
testCases := []struct {
protocol int
syncMode SyncMode
}{
{63, FullSync},
{63, FastSync},
{64, FullSync},
{64, FastSync},
{64, LightSync},
{65, FullSync},
{65, FastSync},
{65, LightSync},
}
for _, tc := range testCases {
t.Run(fmt.Sprintf("protocol %d mode %v", tc.protocol, tc.syncMode), func(t *testing.T) {
t.Parallel()
testDeliverHeadersHang(t, tc.protocol, tc.syncMode)
})
}
}
func testDeliverHeadersHang(t *testing.T, protocol int, mode SyncMode) {
master := newTester()
defer master.terminate()
chain := testChainBase.shorten(15)
for i := 0; i < 200; i++ {
tester := newTester()
tester.peerDb = master.peerDb
tester.newPeer("peer", protocol, chain)
// Whenever the downloader requests headers, flood it with
// a lot of unrequested header deliveries.
tester.downloader.peers.peers["peer"].peer = &floodingTestPeer{
peer: tester.downloader.peers.peers["peer"].peer,
tester: tester,
}
if err := tester.sync("peer", nil, mode); err != nil {
t.Errorf("test %d: sync failed: %v", i, err)
}
tester.terminate()
}
}
type floodingTestPeer struct {
peer Peer
tester *downloadTester
}
func (ftp *floodingTestPeer) Head() (common.Hash, *big.Int) { return ftp.peer.Head() }
func (ftp *floodingTestPeer) RequestHeadersByHash(hash common.Hash, count int, skip int, reverse bool) error {
return ftp.peer.RequestHeadersByHash(hash, count, skip, reverse)
}
func (ftp *floodingTestPeer) RequestBodies(hashes []common.Hash) error {
return ftp.peer.RequestBodies(hashes)
}
func (ftp *floodingTestPeer) RequestReceipts(hashes []common.Hash) error {
return ftp.peer.RequestReceipts(hashes)
}
func (ftp *floodingTestPeer) RequestNodeData(hashes []common.Hash) error {
return ftp.peer.RequestNodeData(hashes)
}
func (ftp *floodingTestPeer) RequestHeadersByNumber(from uint64, count, skip int, reverse bool) error {
deliveriesDone := make(chan struct{}, 500)
for i := 0; i < cap(deliveriesDone)-1; i++ {
peer := fmt.Sprintf("fake-peer%d", i)
go func() {
ftp.tester.downloader.DeliverHeaders(peer, []*types.Header{{}, {}, {}, {}})
deliveriesDone <- struct{}{}
}()
}
// None of the extra deliveries should block.
timeout := time.After(60 * time.Second)
launched := false
for i := 0; i < cap(deliveriesDone); i++ {
select {
case <-deliveriesDone:
if !launched {
// Start delivering the requested headers
// after one of the flooding responses has arrived.
go func() {
ftp.peer.RequestHeadersByNumber(from, count, skip, reverse)
deliveriesDone <- struct{}{}
}()
launched = true
}
case <-timeout:
panic("blocked")
}
}
return nil
}
func TestRemoteHeaderRequestSpan(t *testing.T) {
testCases := []struct {
remoteHeight uint64
localHeight uint64
expected []int
}{
// Remote is way higher. We should ask for the remote head and go backwards
{1500, 1000,
[]int{1323, 1339, 1355, 1371, 1387, 1403, 1419, 1435, 1451, 1467, 1483, 1499},
},
{15000, 13006,
[]int{14823, 14839, 14855, 14871, 14887, 14903, 14919, 14935, 14951, 14967, 14983, 14999},
},
//Remote is pretty close to us. We don't have to fetch as many
{1200, 1150,
[]int{1149, 1154, 1159, 1164, 1169, 1174, 1179, 1184, 1189, 1194, 1199},
},
// Remote is equal to us (so on a fork with higher td)
// We should get the closest couple of ancestors
{1500, 1500,
[]int{1497, 1499},
},
// We're higher than the remote! Odd
{1000, 1500,
[]int{997, 999},
},
// Check some weird edgecases that it behaves somewhat rationally
{0, 1500,
[]int{0, 2},
},
{6000000, 0,
[]int{5999823, 5999839, 5999855, 5999871, 5999887, 5999903, 5999919, 5999935, 5999951, 5999967, 5999983, 5999999},
},
{0, 0,
[]int{0, 2},
},
}
reqs := func(from, count, span int) []int {
var r []int
num := from
for len(r) < count {
r = append(r, num)
num += span + 1
}
return r
}
for i, tt := range testCases {
from, count, span, max := calculateRequestSpan(tt.remoteHeight, tt.localHeight)
data := reqs(int(from), count, span)
if max != uint64(data[len(data)-1]) {
t.Errorf("test %d: wrong last value %d != %d", i, data[len(data)-1], max)
}
failed := false
if len(data) != len(tt.expected) {
failed = true
t.Errorf("test %d: length wrong, expected %d got %d", i, len(tt.expected), len(data))
} else {
for j, n := range data {
if n != tt.expected[j] {
failed = true
break
}
}
}
if failed {
res := strings.Replace(fmt.Sprint(data), " ", ",", -1)
exp := strings.Replace(fmt.Sprint(tt.expected), " ", ",", -1)
t.Logf("got: %v\n", res)
t.Logf("exp: %v\n", exp)
t.Errorf("test %d: wrong values", i)
}
}
}
// Tests that peers below a pre-configured checkpoint block are prevented from
// being fast-synced from, avoiding potential cheap eclipse attacks.
func TestCheckpointEnforcement63Full(t *testing.T) { testCheckpointEnforcement(t, 63, FullSync) }
func TestCheckpointEnforcement63Fast(t *testing.T) { testCheckpointEnforcement(t, 63, FastSync) }
func TestCheckpointEnforcement64Full(t *testing.T) { testCheckpointEnforcement(t, 64, FullSync) }
func TestCheckpointEnforcement64Fast(t *testing.T) { testCheckpointEnforcement(t, 64, FastSync) }
func TestCheckpointEnforcement65Full(t *testing.T) { testCheckpointEnforcement(t, 65, FullSync) }
func TestCheckpointEnforcement65Fast(t *testing.T) { testCheckpointEnforcement(t, 65, FastSync) }
func TestCheckpointEnforcement65Light(t *testing.T) { testCheckpointEnforcement(t, 65, LightSync) }
func testCheckpointEnforcement(t *testing.T, protocol int, mode SyncMode) {
t.Parallel()
// Create a new tester with a particular hard coded checkpoint block
tester := newTester()
defer tester.terminate()
tester.downloader.checkpoint = uint64(fsMinFullBlocks) + 256
chain := testChainBase.shorten(int(tester.downloader.checkpoint) - 1)
// Attempt to sync with the peer and validate the result
tester.newPeer("peer", protocol, chain)
var expect error
if mode == FastSync || mode == LightSync {
expect = errUnsyncedPeer
}
if err := tester.sync("peer", nil, mode); err != expect {
t.Fatalf("block sync error mismatch: have %v, want %v", err, expect)
}
if mode == FastSync || mode == LightSync {
assertOwnChain(t, tester, 1)
} else {
assertOwnChain(t, tester, chain.len())
}
}